autogen(docs): regenerate and update changelog

CHANGELOG.md

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 **Table of Contents**
 
-- [Unreleased (2020-07-16)](#unreleased-2020-07-16)
+- [Unreleased (2020-07-17)](#unreleased-2020-07-17)
     - [Bug Fixes](#bug-fixes)
     - [Code Refactoring](#code-refactoring)
     - [Documentation](#documentation)
@@ -100,7 +100,7 @@
 
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-# [Unreleased](https://github.com/ory/kratos/compare/v0.4.6-alpha.1...a4d99694525e65b58d49197c96324b27fb8c31c2) (2020-07-16)
+# [Unreleased](https://github.com/ory/kratos/compare/v0.4.6-alpha.1...3e9f8cce4b058b05d69c73fff514f3b8e46c2be3) (2020-07-17)
 
 
 ### Bug Fixes
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 * Resolve panic when DSN="memory" ([#574](https://github.com/ory/kratos/issues/574)) ([05e55f3](https://github.com/ory/kratos/commit/05e55f3584e20ae5d39cfda6e542d4da40d718e4)):
 
     > Executing the migration logic in registry.go cause a panic as the registry is not initalized at that point. Therefore we decided to move the handling to driver_default.go, after the registry has been initialized.
+* Use relative threshold to judge longest common substring in password policy ([#585](https://github.com/ory/kratos/issues/585)) ([3e9f8cc](https://github.com/ory/kratos/commit/3e9f8cce4b058b05d69c73fff514f3b8e46c2be3)), closes [#581](https://github.com/ory/kratos/issues/581)
 
 
 ### Code Refactoring